leggings!

sure its been done a million times before but I need some good quality, thick black leggings. Was going to treat myself to some white company ones but the reviews on the website are not that good. Have previously had next and M&S, both OK but the Next ones are quite thin and the M&S ones have faded a bit despite not being worn/washed all that many times. Am size 10, 5' 3". Can wear petite or regular length.